package lab02;

public class Ciycle {
    double radius;//属性：半径

    double area() {
        //行为：圆的面积与周长
        return 3.14 * radius * radius;
    }

    double perimeter() {
        return 2 * 3.14 * radius;
    }

    public static void main(String[] args) {


    }
}